Follow up. I spent some time yesterday looking closer at the slide. fcooper, you are exactly right! Thanks for the advice! On closer examination, the rollers were not even touching on the one inside the cabinet nor the farthest rear roller under the bin. I responded the below on another thread about Holiday Rambler slide adjustment. I was not able to find instructions anywhere in Power Gear's manuals on how to adjust the rollers. And from what I can tell, vertical adjustment of the slide MUST include adjusting the rollers. Hopefully anyone else searching will be able to find it easier this way.
My slide was out of vertical alignment. We first noticed it because the wiper seal wasn't making contact with the side of the slide on the front and in a rain storm, we found the floor around the slide to be wet. After looking closer, I found that the front seal wasn't making contact at the top and the rear seal was excessively crushed at the top and normal looking at the bottom, indicating that the rear of the slide had dropped slightly. I had also noticed that if the coach wasn't perfectly level, the slide creaked and popped when it reached full deployment. I followed Power Gear's instructions for vertical adjustment and wasn't able to make much difference. They only reference the adjustment bolts on the rails that drive the mechanism. After reading fcooper's instructions on adjusting the rollers, I found that the rear rollers (inside the bins as well as inside the coach cabinet) were not even making contact with the floor of the slide for most of the deployment. After several adjustments, and running the slide in and out, (it takes patience!!), the slide now runs much smoother that it ever has since I've owned it, and the seals are engaging properly again. Power Gear doesn't tell you how to adjust the rollers in the vertical height adjustment section, but I now know that it's essential to getting the proper height and plumb adjustments on the slide. As said above, have patience and adjust in small increments!!